Samson Sherrin, 19, was run over by two other boats as he lay unconscious in the water, suffering hip, rib and ankle fractures, neck and head injuries and acute respiratory failure, and nearly drowned.

The theme park visitor, from Brisbane, also caught pneumonia, has struggled with psychological problems and is still receiving counselling.

The Rocky Hollow Log Ride was closed after the accident but was given the all clear by Worksafe Queensland inspectors and reopened two days later.

Mr Sherrin's accident was the second major incident on a Dreamworld ride in six months.

Both the Thunder River Rapids ride and the Rocky Hollow Log Ride were two of the oldest attractions in the park.

How it used to look. Picture: Mike Batterham

The Rocky Hollow Log Ride is 35 years old and has been operating since the theme park, Australia's largest, opened.

Dreamworld also announced another one of its "big nine" thrillseeker rides has opened.

After more than a year of extensive safety checks, the WipeOut ride is also open and fully operational.

The mammoth Gold Coast theme park continues to push back towards recovery since the October 2016 tragedy and the reopening of the Rocky Hollow Log Ride and WipeOut means Dreamworld is at full operational capacity again.

The investigation done on the Thunder River Rapids Ride has been completed with a coronial inquest expected to be completed some time later this year.